Peach tree named ‘Corinthian Pink’

ABSTRACT

A new and distinct cultivar of ornamental peach tree called ‘Corinthian Pink’ is provided that demonstrates a norrowly columnar growth habit, a vigorous growth rate, medium purple foliage, and an abundance of light pink-colored, double flowers. The new cultivar produces very few fruit, and is intended for use as a spring flowering ornamental plant in the home landscape.

SUMMARY OF THE INVENTION

The new and distinct variety of peach (Prunus persica (L.) Batsch)originated as a second generation descendant from a hand pollinatedcross of North Carolina Selection ‘NC174RL’ nectarine (non-patented)×aselection of Japanese ‘Pillar’ peach made in 1983 at the SandhillsResearch Station at Jackson Springs, N.C. The parent plants used in thishybridization have not been named and released and are unavailable incommerce.

The seeds resulting from this controlled hybridization were germinatedin a greenhouse at North Carolina State University, Raleigh, N.C. in theFall of 1983 and planted in the field in Spring of 1984. These treeswere grown to maturity; trees were self pollinated in Spring of 1988,and the resultant seed was harvested in August 1988. This seed was sowndirectly in the field in November 1988, and seedlings flowered in 1991.One seedling, designated NC174RLxPil-172, was selected for its mediumpurple foliage color, narrowly columnar growth habit, and heavyproduction of light pink, double flowers.

During 1993 and 1996, the original plant selection was propagatedasexually by grafting of vegetative buds onto peach seedling rootstock,cultivar ‘Lovell’, at the Sandhills Research Station. A grafted tree ofthe variety was established at the North Carolina State University LakeWheeler Field Laboratory Research Station in Raleigh, N.C. Subsequently,a larger test planting has been established with asexually multipliedplants at the Sandhills Research Station, at the above noted location.

The new variety has routinely been asexually multiplied by grafting,specifically ‘T’ and chip budding. It readily forms a graft union with‘Lovell’ peach rootstock and resumes normal growth. During all asexualpropagation, the characteristics of the original plant have beenmaintained and no aberrant phenotypes have appeared.

Test plantings at the two research station locations noted above, whichvary considerably in soil and climatic conditions, demonstrate thisvariety to be widely adapted to differing soil and climatic conditions.

Plants and fruit of this new variety differ phenotypically from itsantecedents. The new variety produces medium purple leaves and lightpink double flowers, differing from the single pink flowers of ‘NC174RL’and the double pink and white variegated flowers, and green leaves ofthe Japanese ‘Pillar’ peach antecedent. Growth habit is narrowlycolumnar, and fruit are pubescent (peach), distinguishing it from the‘NC174RL’ nectarine antecedent. Plants of ‘Corinthian Pink’ differ from‘Corinthian Rose’, U.S. Plant Pat. No. 11,564, in having lighter pinkflower color and lighter purple foliage. Fruit of this new variety aresmall and of poor quality, and are of no commercial importance.

Plants of the new variety are very vigorous and grow rapidly afterestablishment of trees in the field. Young trees have average 3-4 feetof growth per year. A four-year-old tree measured in Raleigh, N.C. was14.0 feet in height and 4.5 feet in spread, with spread measured 6 feetfrom ground level. Trunk diameter (girth) was 3.9 inches, measured onefoot from ground level. Plants are narrowly columnar in growth habit.The branch angles between the trunk and lateral branches of ‘CorinthianPink’ measure between 5 to 20 degrees, in comparison to non-columnarpeach varieties such as ‘Contender’ (unpatented), which typicallymeasure between 35 to 50 degrees.

Flowering sometimes occurs in the second year of growth, but morecommonly trees begin flowering in the third year after establishment.Flowers are fully double, light pink, and very attractive. Floweringusually begins in mid March in Raleigh, N.C.; the date of first bloomtypically occurs from March 15 to March 30. Full bloom typically occursfrom March 25 to April 10, depending on weather conditions. Bloomduration is typically 10-14 days, and individual flowers last about 7-10days, depending on temperature during bloom. The chilling requirement isestimated to be 950 hours below 4 C, based on comparison of floweringtime to peach varieties ‘Contender’ (unpatented), ‘Winblo (unpatented)’,and ‘Clayton’ (unpatented) at the Raleigh, N.C. test location.

Although ‘Corinthian Pink’ is self fertile and can produce fruit as aresult of self pollination, fertility of flowers is poor, for unknownreasons, unrelated to the pollination requirements of the tree, andfruit set is generally low in most years. It is estimated that less than1% of flowers produced set fruit. Fruit are very small, bitter tasting,and of no horticultural importance in this variety. Fruit ripen in midto late August in Raleigh, N.C.

The new variety has been named the CORINTHIAN PINK cultivar.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying photographs show typical specimens of the entire treeduring and after flowering, and close-up pictures of the foliage,flowers, and fruit in color as nearly true as it is reasonably possibleto make in a color illustration of this character.

FIG. 1 shows a four-year-old tree of ‘Corinthian Pink’ in full bloom atRaleigh, N.C., showing the narrowly columnar tree architecture, flowercolor, and heavy flowering characteristics.

FIG. 2 shows a four-year-old tree of ‘Corinthian Pink’ taken afterflowering, showing the narrowly columnar architecture and theoverallfoliage color.

FIG. 3 shows a close up photograph of the flower of ‘Corinthian Pink’,showing the double flower structure, and the light pink flower color.

FIG. 4 shows a close-up photograph of the foliage of ‘Corinthian Pink’taken about 3 weeks after bud break in the spring.

FIG. 5 shows a close-up of the mature fruit of ‘Corinthian Pink’,

FIG. 6 shows a photograph of the fruit flesh and stone of ‘CorinthianPink’. FIGS. 5 and 6 photographed on Aug. 23, 2000.

DETAILED DESCRIPTION OF THE NEW VARIETY

The following is a detailed description of the botanical and pomologicalcharacteristics of the subject peach. Color data are presented in RoyalHorticultural Society Colour chart designations. Where dimensions,sizes, colors and other characteristics are given, it is to beunderstood that such characteristics are approximations of averages setforth as accurately as practicable.

The descriptions reported herein are from specimens grown at Raleigh,N.C. unless otherwise noted.

Tree:

Size.—Large. 14-16 ft. height after four years of growth.

Vigor.—Very vigorous.

Growth.—Narrowly columnar.

Fruit production.—Low.

Pest resistance.—Susceptible to peach tree borer, moderately resistantto bacterial leaf spot (Sandhills Research Station observations).

Trunk:

Size.—Medium.

Texture.—Medium to rough.

Color.—Gray-green (197-B).

Branches:

Size.—Medium.

Surface.—Smooth (new) to medium rough (old).

Lenticels.—Medium size. Medium number.

Color.—Bright green with slight red blush on sun-exposed portion (newgrowth). Dormant one-year-old shoots gray-red (178-A). Dormanttwo-year-old shoots gray-brown (199-A).

Foliage:

Leaves.—Large. Mature leaf length 14.1 cm; width 4.8 cm.

Form.—Lanceolate. Acutely pointed. Leaf base cuneate.

Thickness.—Medium.

Texture.—Smooth to slightly rugose.

Margin.—Crenate.

Petiole.—Medium length (11.9 mm). Color yellow-green (146B).

Stipules.—Present. Small.

Pubescence.—Absent on both lower and upper surfaces.

Venation.—Pinnate. Color or main vein=red (53-A).

Glands.—Average number 3. Varies from 2 to 5. Located on base of leafand upper portion of petiole. Reniform. Color same as upper leaf blade(183-A).

Color.—Upper surface —Medium purple 183-A (newly emerged) to grayish red178-B (mature leaf). Lower surface (newly emerged) 183-B.

Density.—Dense.

Flower buds:

Size.—Large.

Length.—Medium.

Shape.—Plump, slightly tapered at apex. Typical of peach.

Color.—Light brown.

Pubescence.—Lacking.

Flowers:

Date of first bloom.—March 15 to March 30. Varies yearly due to weatherconditions.

Date of full bloom.—March 25 to April 10. Varies yearly due to weatherconditions.

Size.—Large (diameter=38 mm when fully open), double, showy.

Petal color.—Light pink (red 56-D, newly emerged flowers, red 56A,mature flowers).

Calyx color.—Grayed-purple (183-A).

Pedicel.—Long. Length=14 mm. Color=142-C.

Reproductive organs.—Stamens —erect, numerous. Light pink filaments.Pistils—usually one. Pollen — normal and abundant. Bright yellow.

Number of flowers per bud.—One.

Number of petals per flower.—Average 31.4.

Fertility.—Self-fertile, but fruit set low.

Fruit:

Maturity.—Late. Mid to late August.

Size.—Very small. Average diameter=1.6 in.

Form.—Slightly oblong.

Suture.—Shallow.

Pubescence.—Heavy.

Skin color.—Yellowish-green (154-C) with slight red blush (45C), and redstreak (45-C) on suture.

Flesh color.—Greenish-white (150-D), with small amount of red (46C) nearstone.

Stone.—Small (average diameter=0.65 in., average weight=3.8 grams).Freestone. Color greyed-orange (172-B).

Eating quality.—Very poor.

Uses.—None.

The variety: The most distinctive features of the variety are itsnarrowly columnar growth habit, its medium purple foliage color, and itsdouble (multiple petals) light pink flowers.

We claim:
 1. A new and distinct variety of ornamental peach tree,substantially as illustrated and described, characterized by itsnarrowly columnar growth habit, medium purple foliage color, and large,double, light pink flowers.